PermaSEAL Damp Proof Paint 5L
Rating: 97 / 100
A high performance damp proof paint for damp proofing and vapour proofing multiple surfaces.

Availability: In stock

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RRP £60.00 Excl. VAT
£24.95 Excl. VAT £29.94 Incl. VAT

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RRP £60.00 Excl. VAT
£24.95 Excl. VAT £29.94 Incl. VAT

Damp Proof Paint

PermaSEAL Damp Proof Paint is a high performance damp proof membrane. Simply brush, roller or spray on to a sound masonry surface to create a damp proof and vapour proof membrane.

Our Damp Proof Paint is supplied ready to use straight from the bucket. The consistency is similar to that of thick emulsion paint. It can be supplied as a black or white membrane coating. The membrane is flexible, elastic and is resistant to light abrasion and UV light. It dries to a semi-gloss finish but can also be over-coated when dry with emulsion paints.

Damp Proof Paint Uses Include:

  • A general damp proofing paint for multiple surfaces.
  • Basements: as part of a waterproofing system.
  • Floors: above and below screeds to provide a damp proof membrane.
  • Walls: can be used under a render as a waterproof layer.
  • Externally: below ground a primary waterproofing membrane behind a cavity drain membrane.
  • Tiling: under tiled areas as a secondary protection for wet areas such as bathrooms.
  • Bunds, silage and sewage tanks: protects concrete from silage attack.
  • Gas Barrier: protection against methane and radon penetration.
  • Timber: joist ends can be waterproofed before installation into damp walls.


How to Use Damp Proof Paint



All contact surfaces must be sound, clean and smooth with a trowelled or brushed finish. The substrate must be load-bearing, sound, free of loose material, dust, oil, grease, rubber marks and other substances with a parting effect. Any masonry should be flush and pointed with any defects in existing surfaces made good. Remove any laitance, dust, loose material and surface water.

Please note: Permaseal Damp Proof Paint should not be applied over any previous coatings e.g. emulsion paints, bitumen, oil, grease, rubber marks and other substances with a parting effect.

Using Damp Proof Paint

Stir well before use.

The membrane may be applied by brush, roller or airless spray.

When applying two or more coats, it is recommended that subsequent coats are applied at right angles to the previous coat. Before applying a second coat, it is necessary to allow the first coat to become touch dry, typically one hour. The second coat should be applied within 24 hours of applying the first coat.

How Much Do I Need?

To achieve a damp proof barrier, PermaSEAL Damp Proof Paint must be applied as specified and not stretched to cover larger areas. For the dry film thickness to be 0.6mm, the wet film thickness needs to be 1.1mm. This will be achieved at a coverage rate of 1 litre/m² applied in two coats each of 0.5 litres /m².

For the application of a dry film thickness of greater than 0.3mm in a single coat it is recommended that the membrane is applied by airless spray. Using airless spray, a single application dry coat thickness up to 1mm may be achieved.

For areas of water ingress under hydrostatic pressure we suggest the use of Permaseal Tanking as a waterproof barrier.

Related Content

Return to our Damp Proofing section to browse more products or read our Guide to Internal Damp Proofing. If you still have questions then read our article on Does Damp Proof Paint Really Work? or contact one of the team for free advice.


  • Ready to use straight from the bucket
  • Single pack system, use what you need and then replace the lid
  • Water-based product can be applied to a damp background (no surface water)
  • Non toxic, non hazardous, solvent and plasticiser free, user-friendly
  • Quick drying. Typically touch dry in 1 hour, quick re-coat times
  • Good bond to many substrates
  • Toughness, high flexibility, extensibility and good crack-bridging properties
  • Low water vapour permeability
  • Alkali resistant - can be applied to alkaline surfaces
  • Resistant to silage acids
  • Non-staining
Model: PDPP
Manufacturer: Permagard
Packaging: Individually
Size: 5 Litres
Dilution: Ready to use emulsion
Coverage: 10m² per 5 litre container or 5m² for two coats. This product should be applied in a minimum of two coats, each of 0.5 litres/m².
Country of Manufacture: United Kingdom

A quality product, would be nice to buy a smaller tub

I was trying to solve a damp problem on a chimney breast in a previously neglected house. A leaking gutter had poured rain onto the outside wall for years. A year after renovation, the chimney breast was still damp. I really appreciated the advice available from Permaguard technical people that it could take months more to dry. I applied the damp proof membrane to the external wall 6 months ago and salt neutraliser on the inside. The damp then seemed to get worse for many weeks as it was drawn through to the inside, but eventually dried and stayed dry. I've applied this damp proof paint for good measure to ensure no stain comes through any decoration, but I only needed a small amount. It would be great to be able to buy this and the other Permaguard products in small quantities. Most will be wasted. I also struggled with the lid and couldn't get it off but realised I could pull up the spout under the red cover and then pour some into a paint tub. Some instructions on opening would be very useful.
Review by Deb on 30 Jan 2016

Good Stuff, what's not to like?

Bought 6 cans and it was an absolute pain in the nether regions trying to get the lid off the cans. Is it just me or does anyone else have the same trouble? Had to spend a good 10 minutes with screwdrivers, water pump pliers and chisels just trying to get the cans open!
Having said that, the rest was a breeze, paint went on like a dream liberally with brush and roller, easy to apply, does what it says on the tin, am well happy if somewhat knackered!
Review by Mr Fixit on 04 Aug 2015

Does what it says on the tin

Very easy to use and is holding the damp back
Review by Steve Ford on 30 Jun 2014

Money well spent

Great product with many uses as explained to me by Steve
Review by Anon on 16 May 2013

Brilliant product

I was recommended to use this product under a replacement parquet floor in our lounge. The original was damaged by damp coming up through the concrete slab. The damp proof paint was very easy to apply (like emulsion paint). We applied two coats in three hours then laid our floor the next day. I now feel very confident that damp will not damage the floor again. Thank you Permagard.
Review by Sue Gibbs on 05 Apr 2013

Quick and easy to use

Used as a wet room paint, easy to apply, quick drying, got two coats on in 2 hours then tiled over. Used what I had left to cover water marks on the ceiling below the bathroom then painted over with standard magnolia emulsion to match the rest of the ceiling.

Happy customer
Review by GTR Driver on 29 Jan 2013

Good value and easy to use

I purchased this product to use on the inside wall of my garage to cover up damp patches that appear when it rains heavily on the external wall. I applied two coats as per the data sheet and it has stoped the damp showing when it rains. Very easy to apply, I managed to get two coats on in one day. Thank you to the technical team for their help and advice.
Review by Jane on 12 Nov 2012

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